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dimanche 9 juin 2013

I just founda plug-in extensionforQGisthat would allowme to add a number of image services to your map canvas :

Installing the Plugin

The OpenLayers plugin is installed like all other Python plugins. From the the Plugins menu in QGIS, choose Fetch Python Plugins. This brings up the plugin installer. To find the plugin, enter openlayers in the Filter box, then select OpenLayers Plugin from the list. Once it’s highlighted, click the Install plugin button. This will download the plugin from the repository, install it, and load it into QGIS.

Using the Plugin

The OpenLayers Plugin uses your view extent to fetch the data from the service you choose. For this reason you should load at least one of your own layers first. Since each of the services are expecting a request in latitude/longitude your layer either has to be geographic or you must enable on the fly projection.

To add one of the services you have two choices; you can pick the service from the Plugins->OpenLayers plugin menu or you can use the OpenLayers Overview. The Overview opens a new panel that allows you to choose a service from a drop-down list. Click the Enable map checkbox to enable the drop-down list and preview the service you want to add. If you are happy with what you see, you can add it to the map by clicking the Add map button.

The KML2Shape tool is a superb and easy tool to convert KML file to a shape created bu Zonum solution

All we need to do is just create the KML or KMZ file on GoogleEarth then simply go to the Zonum’s web. Click New then upload your KML/KMZ file using Upload KML/KMZ button. Wait until the dialogue box closed then click on Process KML. It will result just like below inside the box:

Entities found:

# Points: 0
# Paths: 1
# Inner Polygons: 0
# Outer Polygons: 0

Make sure you choose the appropriate Shapes to export. Then just simply click on Export SHP button. A new window will appear, click on Download,
it is gonna download a zip file. Extract the file. You’ll find 4 files.

jeudi 23 mai 2013

The World Digital Library (WDL) makes available on the Internet, free of charge and in multilingual format, significant primary materials from countries and cultures around the world from 8000 BC to 2009 AD and DOWNLOAD them in TIF and other known formats !

Type of Data/Materials Available :

Maps

Prints, Photographs

Books

Manuscripts

Motion Pictures

Sound Recordings

The principal objectives of the WDL are to:

Promote international and intercultural understanding;

Expand the volume and variety of cultural content on the Internet;

Provide resources for educators, scholars, and general audiences;

Build capacity in partner institutions to narrow the digital divide within and between countries.

The WDL makes it possible to discover, study, and enjoy cultural treasures from around the world on one site, in a variety of ways. These cultural treasures include, but are not limited to, manuscripts, maps, rare books, musical scores, recordings, films, prints, photographs, and architectural drawings.

Items on the WDL may easily be browsed by place, time, topic, type of item, and contributing institution, or can be located by an open-ended search, in several languages. Special features include interactive geographic clusters, a timeline, advanced image-viewing and interpretive capabilities. Item-level descriptions and interviews with curators about featured items provide additional information.

Navigation tools and content descriptions are provided in Arabic, Chinese, English, French, Portuguese, Russian, and Spanish. Many more languages are represented in the actual books, manuscripts, maps, photographs, and other primary materials, which are provided in their original languages.

The WDL was developed by a team at the U.S. Library of Congress, with contributions by partner institutions in many countries; the support of the United Nations Education, Scientific, and Cultural Organization (UNESCO); and the financial support of a number of companies and private foundations.

This book addresses the full spectrum of analytical techniques that are provided within modern Geographic Information Systems and related geospatial software products. It covers the principal concepts of geospatial analysis and their origins and methodological context.

dimanche 21 avril 2013

Intresting article from ESRI Blog

by Juan Laguna and Xuguang onApril 18, 2013

With Spatial Analyst you can perform visibility analysis, but
you may have found that altering the parameters of the operation can be a
little tedious. Well, we have a new solution for you! Available for
download is a new Interactive Visibility add-in toolbar.

Background
A viewshed identifies the cells in an input raster that can be seen
from one or more observation locations. Traditionally, the Viewshed and
Observer Points geoprocessing tools have been used for visibility
analysis in ArcGIS for Desktop. These tools take two inputs, a raster
elevation surface and a feature input identifying the observer
locations. This means two things. First, you had to have a feature
dataset of points already prepared. Second, while you could control the
vertical and horizontal fields of view each observer, as well as the
visibility distance limit, this had to be done through the attributes of
the featureclass. Certainly capable, but not particularly easy to
adjust and model different scenarios with.Interactive Visibility toolbar Add-in
This toolbar provides a dynamic, interactive way to create viewsheds on a raster surface.

With this add-in you can:

Add observation locations directly on the map with a cursor.

See the combined viewsheds of all your observation locations update as you add more of them to your map display.

Adjust the location of any existing observer point, and see the viewshed update based on the the new observer location.

Change the field of view for each location dynamically.

While the default behaviour of the Add-in achieves good performance
by using the screen resolution to determine visibility, you can also
specify that calculations be performed at the full resolution of the
data, trading off some performance for greater accuracy.Downloading and installing
The Interactive Visibility toolbar Add-in is available for download here:http://esriurl.com/InteractiveVisibility